Common T2 Filing Mistakes to Avoid in Canada

Filing a corporate income tax return involves more than transferring numbers from accounting software into a tax form. A T2 return must accurately reflect the corporation’s financial records, tax adjustments, ownership structure, provincial activities, and transactions with shareholders.

Many T2 filing mistakes in Canada begin before the return is prepared. Incomplete bookkeeping, unreconciled accounts, incorrectly recorded shareholder withdrawals, and missing supporting documents can all produce inaccurate tax results.

Other errors happen during the tax preparation process, such as using the wrong deadline, omitting a required schedule, claiming an expense incorrectly, or failing to file a separate provincial return.

Understanding the most common T2 filing mistakes to avoid can help a corporation reduce penalties, interest, reassessments, and unnecessary correspondence with the Canada Revenue Agency. For a full overview of the corporate tax filing process, see our complete guide to corporate tax returns in Canada.

1. Assuming That No Tax Payable Means No T2 Return Is Required

One of the most serious mistakes is assuming that a corporation does not have to file a T2 return because:

• it did not earn any revenue;
• it operated at a loss;
• it had no tax payable;
• it was inactive;
• it has not yet started doing business; or
• it is planning to close.

Canadian resident corporations generally have to file a T2 Corporation Income Tax Return for every tax year, including inactive corporations and corporations with no tax payable. Limited exceptions apply to certain entities, such as registered charities and specific tax-exempt organizations.

A corporation normally continues to have filing obligations until it has been legally dissolved and its tax accounts have been properly closed. Simply stopping business activities does not eliminate the obligation to file.

How to avoid this mistake

Confirm the corporation’s legal status before deciding that no return is required. If the corporation still exists, determine whether a nil or inactive T2 return must be filed for the year.

2. Confusing the T2 Filing Deadline With the Tax Payment Deadline

A corporation’s T2 filing deadline and its income tax payment deadline are not the same.

The T2 return is generally due within six months after the corporation’s tax year-end. However, the remaining corporate income tax balance is generally due two months after the year-end.

Certain Canadian-controlled private corporations may qualify for a three-month balance-due deadline if the applicable conditions are satisfied.

For example, a corporation with a December 31 year-end may have:

• a tax payment deadline of February 28 or March 31, depending on its circumstances; and
• a T2 filing deadline of June 30.

Waiting until the T2 filing deadline to calculate the corporate tax can therefore result in several months of arrears interest.

Late-filing penalties may also apply when a return is filed after the six-month deadline and tax was unpaid at the filing deadline. The standard federal penalty is generally 5% of the unpaid tax, plus 1% for each complete month the return is late, up to 12 months. Higher penalties may apply in repeated-failure situations. For a detailed breakdown, see our article on CRA penalties for late corporate tax filing.

How to avoid this mistake

Begin the year-end process early enough to estimate the tax payable before the balance-due date, even when the final financial statements and T2 return will be completed later.

3. Filing Before the Accounting Records Are Properly Reconciled

A T2 return is only as reliable as the accounting records supporting it.

Preparing the return from an unreconciled trial balance can cause income, expenses, assets, liabilities, and shareholder transactions to be reported incorrectly. Common unresolved items include:

• bank transactions that have not been recorded;
• duplicated or missing sales;
• unreconciled credit cards;
• outstanding payroll liabilities;
• incorrect GST/HST or QST balances;
• unpaid supplier invoices;
• customer deposits recorded as revenue;
• personal expenses paid by the corporation;
• shareholder withdrawals posted to general expenses; and
• prior-year balances that do not agree with the previous financial statements.

These problems may affect both the financial statements and the taxable income calculation.

How to avoid this mistake

Before preparing the T2 return, reconcile at least the following. For a full list of records needed, see our guide on documents required for T2 filing:

• All corporate bank and credit card accounts
• Accounts receivable and accounts payable
• Payroll source deductions and payroll expense
• GST/HST and, where applicable, QST accounts
• Loans, leases and financing balances
• Fixed assets and disposals
• Shareholder and related-party accounts
• Opening balances to the previous year’s financial statements

Material unexplained balances should be investigated rather than carried forward automatically.

4. Reporting Incorrect Financial Statement Information Through GIFI

Corporations normally report their financial statement information using the General Index of Financial Information, commonly called GIFI.

GIFI assigns a specific code to each balance sheet and income statement item. The financial information reported on the T2 return should agree with the corporation’s completed financial statements or year-end trial balance.

Errors may occur when:

• revenue is entered under the wrong GIFI code;
• assets and liabilities are classified incorrectly;
• shareholder loans are reversed;
• expenses are grouped inconsistently from one year to another;
• retained earnings do not reconcile;
• the balance sheet does not balance; or
• financial statement amounts are entered twice.

The CRA generally does not require the corporation’s conventional financial statements to be attached when the information has been reported through GIFI. This makes the accuracy of the GIFI information particularly important.

Schedule 141 also provides information about who prepared or was involved with the financial information and the extent of that involvement.

How to avoid this mistake

Complete the financial statements or finalized year-end trial balance before entering the GIFI information. Compare the GIFI balance sheet, income statement, retained earnings, and net income to the source financial records.

5. Treating Accounting Income as Taxable Income Without Adjustments

The net income shown in the corporation’s financial statements is not necessarily its income for tax purposes.

Schedule 1 of the T2 return reconciles accounting net income to income calculated under Canadian income tax rules.

Corporate tax filing errors can arise when the preparer fails to adjust for items such as:

• income tax expense;
• accounting depreciation and amortization;
• non-deductible meals and entertainment;
• penalties and fines that are not deductible;
• shareholder or personal expenses;
• provisions and reserves that are not currently deductible;
• capital expenditures recorded as expenses;
• gains or losses on the disposal of capital assets; and
• other expenses that do not meet the tax deductibility rules.

The opposite problem can also occur. A corporation may overlook deductions that are available for tax purposes but are not reflected as expenses in the financial statements.

How to avoid this mistake

Review every significant or unusual income statement account and document the related tax treatment. Do not assume that an expense is deductible merely because it appears in the accounting records.

6. Deducting Capital Purchases as Regular Operating Expenses

Purchases that provide a lasting benefit to the corporation may need to be treated as capital assets rather than immediately deducted as operating expenses.

Examples can include:

• computers and office equipment;
• vehicles;
• furniture;
• machinery;
• major leasehold improvements;
• buildings; and
• certain software or technology systems.

The tax deduction for depreciable capital property is generally calculated through capital cost allowance, or CCA. Schedule 8 is used to calculate CCA, recapture and terminal losses.

Incorrectly deducting a capital purchase as a current expense may overstate the corporation’s deductions. Failing to record a qualifying asset, on the other hand, may cause the corporation to miss available CCA deductions.

The correct treatment depends on the nature of the expenditure and the relevant CCA class. Repairs, maintenance and improvements must also be reviewed carefully because similar-looking expenditures may receive different tax treatment.

How to avoid this mistake

Review large, unusual or non-recurring expenses separately. Maintain a fixed asset continuity schedule showing:

• the original acquisition date;
• the tax cost;
• the CCA class;
• additions during the year;
• disposals during the year; and
• accumulated CCA claimed.

7. Mishandling Shareholder Withdrawals, Loans and Benefits

Transactions between a corporation and its shareholders are a frequent source of T2 errors.

An owner may withdraw corporate funds and assume that the withdrawal can simply be classified later as salary, a dividend, a reimbursement or a shareholder loan. Each of these treatments has different legal, accounting, payroll and tax consequences.

Potential problems include:

• personal purchases recorded as corporate expenses;
• shareholder withdrawals left in an unexplained clearing account;
• dividends recorded without the necessary corporate documentation;
• salary accrued without appropriate payroll reporting;
• shareholder loans that remain outstanding;
• corporate expenses paid personally but never reimbursed; and
• the personal use of corporate assets not reviewed for a taxable benefit.

Amounts received from a corporation by a shareholder can result in income inclusions or taxable benefits, depending on the facts and the applicable shareholder-loan and benefit rules.

A year-end journal entry alone does not necessarily correct an improperly structured transaction.

How to avoid this mistake

Reconcile the shareholder account before finalizing the return. Every material transaction should be supported by a clear explanation and classified as one of the following:

• business expense reimbursement;
• salary or bonus;
• dividend;
• repayment of an amount owed to the shareholder;
• shareholder loan advance;
• capital contribution; or
• another properly documented transaction.

Dividends should also be supported by the appropriate corporate resolutions and tax slips where required.

8. Overlooking Associated Corporations

Corporations under common ownership or control may be associated for income tax purposes.

Associated Canadian-controlled private corporations generally have to share the federal small business limit rather than each corporation claiming the full limit independently. Schedule 23 is used to document the allocation of the business limit among associated CCPCs.

Association can arise through direct ownership, indirect ownership, relationships between shareholders, control by related groups, or combinations of ownership and control. It is not limited to situations where one corporation directly owns another.

Failing to identify associated corporations may result in:

• an excessive small business deduction;
• an incorrect corporate tax rate;
• an incorrect instalment calculation;
• missing Schedule 23 information;
• reassessments affecting more than one corporation; and
• interest on additional tax payable.

How to avoid this mistake

Review the corporation’s complete ownership structure annually. Ask about other corporations owned directly or indirectly by the shareholders and their family members rather than relying only on the corporation’s legal name or bank accounts.

9. Forgetting Required T2 Schedules, Elections or Information Returns

The T2 form is only the core of the corporate income tax filing. Depending on the corporation’s activities, additional schedules, elections or information returns may be required.

Examples include schedules dealing with:

• losses carried forward or applied;
• capital cost allowance;
• capital gains and losses;
• dividends received or paid;
• refundable taxes;
• associated corporations;
• provincial tax allocation;
• foreign transactions;
• foreign affiliates;
• foreign property;
• scientific research and experimental development; and
• corporate reorganizations.

The applicable schedules depend on the corporation’s specific facts. A return may pass basic software validation while still being incomplete from a tax compliance perspective.

Separate information returns can also have their own deadlines and penalty systems. Filing the T2 return does not automatically satisfy every corporate reporting obligation.

How to avoid this mistake

Use a year-end questionnaire that identifies changes in ownership, new investments, foreign activities, asset purchases, property dispositions, dividends, loans, reorganizations and transactions with related parties.

10. Failing to File the Correct Provincial Corporate Return

The federal T2 return generally includes the provincial or territorial corporate income tax calculation for jurisdictions administered by the CRA.

Quebec and Alberta are important exceptions. Corporations with a permanent establishment in Quebec or Alberta may have to file a separate provincial corporate income tax return in addition to the federal T2.

A Quebec corporation will generally have to consider the Quebec CO-17 Corporation Income Tax Return. An Alberta corporation may have to file the Alberta AT1 Corporate Income Tax Return.

For taxation years beginning on or after January 1, 2024, Quebec corporations are generally required to file their corporation income tax returns online.

For Alberta taxation years beginning after December 31, 2024, corporations are generally required to file the AT1 electronically, subject to limited exceptions. Alberta indicates that a $1,000 penalty can apply when a corporation required to file electronically does not comply.

Corporations operating in more than one province must also determine where they have permanent establishments and how taxable income should be allocated.

How to avoid this mistake

Confirm where the corporation carries on business, employs personnel, maintains offices, concludes contracts, or otherwise has a permanent establishment. Do not assume that the province shown on the incorporation certificate is necessarily the corporation’s only tax jurisdiction.

11. Filing on Paper When Electronic Filing Is Required

For tax years beginning after 2023, most corporations are required to file their T2 returns electronically. Limited exceptions apply to certain insurance corporations, non-resident corporations, corporations reporting in functional currency and certain tax-exempt corporations.

The CRA can impose a $1,000 penalty when a corporation that is required to file electronically submits its return using a non-compliant filing method.

Printing the return and mailing it to the CRA is therefore no longer an acceptable default method for most corporations.

How to avoid this mistake

Use current CRA-certified corporate tax software and verify that the tax year is eligible for electronic filing. When a tax professional transmits the return, the applicable authorization and certification requirements must also be completed.

12. Assuming the Return Was Filed Without Receiving Confirmation

Completing a T2 return in tax software is not the same as filing it.

An electronic transmission may be rejected because of an incorrect business number, tax year, corporation type, access code, address or other validation issue.

A successful filing normally generates a confirmation number. The CRA treats the confirmation as evidence that the return was received. If the return is rejected, the error must be corrected and the return retransmitted.

Saving a PDF copy of the return without completing the transmission does not meet the filing obligation.

How to avoid this mistake

Retain:

• the electronic filing confirmation number;
• the date of transmission;
• the signed electronic filing authorization;
• a final copy of the return;
• the supporting financial statements; and
• the working papers used to prepare the return.

13. Ignoring the Notice of Assessment

The filing process does not end when the T2 return is transmitted.

The CRA may assess the return as filed, make changes during processing, apply payments differently than expected, carry balances forward, or request supporting information.

Failing to review the Notice of Assessment can allow an error to remain unresolved until interest or collection activity appears later.

A corporation can request a reassessment when information was reported incorrectly or something was omitted from the original T2 return. Electronic adjustment requests are generally the fastest method.

How to avoid this mistake

Compare the Notice of Assessment to the filed return and verify:

• taxable income;
• federal and provincial tax;
• loss balances;
• refundable tax balances;
• instalments and payments applied;
• interest and penalties;
• refund amounts; and
• any CRA adjustments or explanatory messages.

Errors should be addressed promptly rather than corrected silently in the following year.

A Practical T2 Filing Review Checklist

Before authorizing the corporate tax return for filing, confirm that:

• The legal corporation name and business number are correct.
• The tax year agrees with CRA records.
• All bank and credit card accounts are reconciled.
• Revenue agrees with the accounting records and applicable sales tax returns.
• Payroll expense agrees with payroll filings.
• GST/HST and QST accounts are reconciled.
• Shareholder and related-party accounts have been reviewed.
• Capital asset additions and disposals have been identified.
• The financial statements agree with the GIFI information.
• Schedule 1 properly reconciles accounting and taxable income.
• Loss carryforwards and other tax balances agree with prior assessments.
• Associated corporations have been identified.
• The correct federal and provincial returns are being filed.
• Required schedules, elections and information returns have been considered.
• The tax balance was paid by the applicable payment deadline.
• The electronic filing confirmation has been saved.
• The Notice of Assessment will be reviewed after processing.

Corporations should generally keep their supporting books, records and tax documents for at least six years. Longer retention may be appropriate for permanent records and documents supporting assets or transactions that continue to affect future tax years.

Can a T2 Filing Mistake Be Corrected?

Yes. Many errors can be corrected by requesting a reassessment after the original T2 return has been assessed.

The correction should clearly identify the amounts being changed and provide the revised schedules or supporting documents required to explain the adjustment.

However, simply because an error can be corrected does not mean there will be no consequences. Additional tax, arrears interest or penalties may still apply, depending on the nature of the mistake and when it is corrected.

Where an error affects multiple years, shareholder income, payroll reporting, GST/HST, QST or separate information returns, several coordinated amendments may be necessary.

Frequently Asked Questions

What is the most common T2 filing mistake?

One of the most common mistakes is waiting until the six-month filing deadline to calculate the tax payable. The tax payment is generally due two or three months after the year-end, well before the T2 filing deadline.

Incomplete accounting records and incorrectly classified shareholder transactions are also frequent sources of problems.

Does an inactive corporation still have to file a T2 return?

Generally, yes. A resident corporation normally has to file a T2 return every year even when it is inactive or has no tax payable, unless it falls within a specific exception.

Can I file a corporate tax return using bookkeeping records that are not finalized?

A return can technically be prepared from available records, but filing before the accounts are properly reconciled creates a significant risk of errors. The financial statements, GIFI information and tax calculations should be based on complete and supportable year-end records.

Are corporate financial statements sent with the T2 return?

Financial statement information is normally reported using GIFI codes. Conventional financial statements are generally retained with the corporation’s records rather than submitted with the electronically filed T2 return.

What happens if a T2 return is filed late but no tax is payable?

The standard late-filing penalty is calculated using unpaid tax, so there may be no ordinary late-filing penalty when no tax is payable. However, filing late can still create compliance problems, delay access to losses or refunds, affect tax accounts and expose the corporation to other penalties where separate forms or electronic filing requirements were not satisfied.

Does filing a T2 also file the Quebec or Alberta return?

No. The T2 generally includes provincial corporate income tax for provinces and territories administered by the CRA, but Quebec and Alberta administer their own corporate income tax returns. A separate CO-17 or AT1 may therefore be required.

Reduce the Risk of Corporate Tax Filing Errors

The best way to prevent corporate tax filing errors is to treat the T2 return as the final step in a structured year-end process—not as a standalone form.

Accurate bookkeeping, reconciled shareholder accounts, complete financial statements, properly prepared tax schedules and a review of all applicable federal and provincial obligations should occur before the return is transmitted.

T2Online.ca is the dedicated corporate year-end platform of DFD Chartered Professional Accountant Inc. It specializes in T2 returns and CPA-signed Compilation Engagement Financial Statements for incorporated businesses across Canada.

Through a structured online intake process, T2Online.ca helps corporations organize their year-end documents, identify missing information and complete their corporate tax filings accurately and efficiently.

Need help preparing your corporation’s year-end and T2 return? Contact T2Online.ca to determine which corporate tax filing service is appropriate for your business.

This article provides general information only. Corporate tax results depend on the corporation’s specific facts, ownership structure, province of operation and transactions during the year. Professional advice should be obtained before implementing a tax filing position or correcting a previously filed return.